Sure, you can use exFat if you like. However, one thing you should be aware of with using any FAT file system... FAT (including FAT-32, exFAT) is a non journaled file system and subject to uncorrectable CRC errors especially when transferring large files or large amounts of data. Whereas HFS+ and NTFS are full journaled files systems giving better stability and more robust correction of CRC and other errors.